Commitments and Contingencies - Narrative (Detail) $ in Millions	Mar. 31, 2020 USD ($) Facility	Dec. 31, 2019 USD ($)
Commitment And Contingencies [Line Items]
Number of sites cited as potentially responsible party | Facility	3
Number of previously and currently owned sites with potential remediation obligations | Facility	6
Donnelley Financial Solutions, Inc.
Commitment And Contingencies [Line Items]
Potential contingent obligations | $	$ 4.8	$ 5.5
LSC Communications, Inc.
Commitment And Contingencies [Line Items]
Potential contingent obligations | $	$ 72.0	$ 78.8